Hmm.... The way I see it, I'd still need to hook up the idle solenoid to the idle relay (on the relay board) and the master relay to the ignition. I don't trust my original harness or relays at all. If it does lights and alternator... fine, I'm not out to rewire the whole car. But the engine management stuff, I would like to have all from scratch. I'm pulling a whole new wire from the fuel pump anyway, because the old one is.... old and brittle. The ground and positives will be clean and new, and current won't be affected as with the old wiring.
Additionally the injector, fuel pump and main fuses are also on the board. It's quite useful, if you ask me.
So... I don't think I threw money away on this one.
sil80
Modified by sil80drifter at 11:07 PM 3/22/2007
Megasquirt Write-up for KA24 series engines.
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sil80drifter
- Posts: 1313
- Joined: Sun Aug 18, 2002 5:53 am
- Car: 1990 240SX Hatch
Re: (sil80drifter)
I think I'm going to go ahead and buy one of these.
I'm wondering though, what all would have to be rewired if I choose to use a new harness Vs splicing into the factory wires? I realy don't think my wiring is in all that bad of shape but if it's not too much trouble new wiring might be nice.
Also, does anyone know how the MS addresses the fast idle control for the AC? I know it works with the idle control but couldn't find any mention of the accessory controler.
I'm wondering though, what all would have to be rewired if I choose to use a new harness Vs splicing into the factory wires? I realy don't think my wiring is in all that bad of shape but if it's not too much trouble new wiring might be nice.
Also, does anyone know how the MS addresses the fast idle control for the AC? I know it works with the idle control but couldn't find any mention of the accessory controler.
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The_Chosen_One
- Posts: 1664
- Joined: Tue Oct 17, 2006 2:05 pm
- Car: 2009 Subaru Impreza 2.5i
- Contact:
Re: (The_Chosen_One)
Chosen one have you ever tried to wire MS WITH the relay board? Dude, it simplifies things so much. Taping your fuse box is kind of a PITA, plus all your relays are 100K miles+ generally. I started to wire up MS without it, then did research on the relay board and switched to it.
First of all, instead of dealing with 6-8 ground wires for each sensor, you deal with one. From that one ground wire you can run wires to the 2 major ground points on the KA, and your set.
You also eliminate relay setup for the FP, which is a pain to even get at. The wires criss cross in the cab from the FP, go to the relay, and from the relay they go up underneath the dash to the ECU.
To top it all off, the relay board makes things so easy to install, and then later, to diagnose if any problems arise. Its got 20 different connectors, each one having a place where the wire or wires go into, then you tighten down the screw and your connection is made. Like the connections on an amp for car audio, except smaller.
There are other reasons to switch to the relay board im sure, but i cant think of anything else right now.
As a side-note, i just finished installing my MS unit, and tomorrow i go to test all the sensors and that good stuff. I would HIGHLY RECOMMEND the relay board.
The IAC-FCID unit is a PWM/Stepper type motor, and MS can control those types of circuts. However no one knows how to do it yet. I just left all those idle control systems connected to the ECU, so i dont have to worry about losing any drivability.
Modified by 480sx at 9:46 AM 4/20/2007
First of all, instead of dealing with 6-8 ground wires for each sensor, you deal with one. From that one ground wire you can run wires to the 2 major ground points on the KA, and your set.
You also eliminate relay setup for the FP, which is a pain to even get at. The wires criss cross in the cab from the FP, go to the relay, and from the relay they go up underneath the dash to the ECU.
To top it all off, the relay board makes things so easy to install, and then later, to diagnose if any problems arise. Its got 20 different connectors, each one having a place where the wire or wires go into, then you tighten down the screw and your connection is made. Like the connections on an amp for car audio, except smaller.
There are other reasons to switch to the relay board im sure, but i cant think of anything else right now.
As a side-note, i just finished installing my MS unit, and tomorrow i go to test all the sensors and that good stuff. I would HIGHLY RECOMMEND the relay board.
The IAC-FCID unit is a PWM/Stepper type motor, and MS can control those types of circuts. However no one knows how to do it yet. I just left all those idle control systems connected to the ECU, so i dont have to worry about losing any drivability.
Modified by 480sx at 9:46 AM 4/20/2007
Re: (480sx)
Are you sure about the IACV? I've observed mine and it seems to be a thermal valve.
Anyway, How does the MS relay board work with all the accessories and would it be a benefit even if my dash is out?
Also, as per the write up, do I need to buy 2, 12V relays to wire the injectors up as shown or are these found in the vehicle somewhere.
Anyway, How does the MS relay board work with all the accessories and would it be a benefit even if my dash is out?
Also, as per the write up, do I need to buy 2, 12V relays to wire the injectors up as shown or are these found in the vehicle somewhere.
Re: (Edub1)
The main IAC for the 240 is a thermal. That discussion we were having was about another IAC device called a FCID valve. Unless you have AC, it wont mater at all.
If you get the relay board it takes care of your injector problem.
The relay board wont replace your stock relays, it only controls all the engine bay wiring for MS. So, to answer your question, it would still be a benefit, however it really wouldnt matter if your dash was in or not.
If you get the relay board it takes care of your injector problem.
The relay board wont replace your stock relays, it only controls all the engine bay wiring for MS. So, to answer your question, it would still be a benefit, however it really wouldnt matter if your dash was in or not.
Re: (480sx)
I don't want to spend another $200 on that thing. I do have air and will be keeping it. Are you saying to hook that valve up as a stepper and let the IACV do it's own thing from hardwire?
Am I right in understanding that I need to cut the constant hot and add those two relays to the system for the injectors if I don't have the relay box?
Am I right in understanding that I need to cut the constant hot and add those two relays to the system for the injectors if I don't have the relay box?
Re: (The_Chosen_One)
On the first page figure 2 for wiring the distributor for the 89-90 shows a 1k .25w resistor going to a 12v source. Is there any reason this can't be spliced into the 12v source going to the B/W wire?
Modified by Edub1 at 3:08 PM 8/19/2007
Modified by Edub1 at 3:08 PM 8/19/2007